Once Upon a Time in a Battlefield

Jung Jin-young

Kim Yu-sin

Park Joong-hoon

Gye-baek

Lee Moon-sik

Geoshigi

Lee Won-jong

Yeon Gaesomun

Kim Byong-chul

Shilla Spy

Kim Seon-a

Gye-baek's Wife

Ryu Seung-su

Kim In-moon

Woo Hyeon

Owner

Kim Seung-woo

Mole 1

Shin Hyun-jun

Mole 2

Ko Kyu-pil

Baekje Prince 7

Shin Jung-keun

Kim Heum-soon

Na Hae-ryung

Gye-baek's Eldest Daughter

Jung Hae-kyun

Cipher Officer

Lee Sang-hun

Soldier

Kim Kwang-shik

Baekje Soldier

Yang Jin-woo

Gwan-chang

Kim Sang-won

Silla Soldier 5 / Cuckoo 1